Aquarium tank



FIG. 1 is a top and right front perspective view of an aquarium tank, showing my new design;

FIG. 2 is a top and right front perspective view thereof with a cover of a lid open;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a left side elevational view thereof the opposite side can be seen in FIGS. 1 and 2.

The bottom is plain and unornamented. 

The ornamental design for an aquarium tank, as shown and described. 